Add AppData manifest (#1445)

Rename desktop file to proper UUID name scheme

chatterino.pro

@@ -509,7 +509,7 @@ linux:isEmpty(PREFIX) {
 }
 
 linux {
-    desktop.files = resources/chatterino.desktop
+    desktop.files = resources/com.chatterino.chatterino.desktop
     desktop.path = $$PREFIX/share/applications
 
     build_icons.path = .

resources/com.chatterino.chatterino.appdata.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- 2019 Artem Polishchuk <ego.cordatus@gmail.com> -->
+<component type="desktop-application">
+    <id>com.chatterino.chatterino.desktop</id>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>MIT</project_license>
+    <content_rating type="oars-1.0">
+        <content_attribute id="social-chat">intense</content_attribute>
+    </content_rating>
+    <name>Chatterino</name>
+    <summary>
+        Chat client for twitch.tv
+    </summary>
+    <description>
+        <p>
+            Chatterino 2 is the second installment of the Twitch chat client series
+            "Chatterino".
+        </p>
+    </description>
+    <screenshots>
+        <screenshot type="default">
+            <image>https://chatterino.com/img/screenshot-3.png</image>
+        </screenshot>
+    </screenshots>
+    <keywords>
+        <keyword>chat</keyword>
+        <keyword>twitch</keyword>
+    </keywords>
+    <url type="homepage">https://chatterino.com/</url>
+    <url type="bugtracker">https://github.com/Chatterino/chatterino2/issues</url>
+    <url type="donation">https://streamelements.com/fourtf/tip</url>
+    <provides>
+        <binary>chatterino</binary>
+    </provides>
+</component>

resources/resources_autogenerated.qrc

@@ -28,7 +28,7 @@
     <file>buttons/unmod.png</file>
     <file>buttons/update.png</file>
     <file>buttons/updateError.png</file>
-    <file>chatterino.desktop</file>
+    <file>com.chatterino.chatterino.desktop</file>
     <file>chatterino.icns</file>
     <file>contributors.txt</file>
     <file>emoji.json</file>